南北方牧场围产牛生产性能的月份变化规律比较研究OA北大核心CSTPCD

The aim of this experiment was to investigate the impact of different months on the feed in-take,calving rate,colostrum quality,calf birth weight,and calf survival rate of perinatal cows in northern and southern regions.19 northern farms and 8 southern farms were selected,and various indicators were collected and analyzed to study the monthly variations in perinatal cows in different regions.The results in-dicated that compared to northern farms,the dry matter intake of cattle in southern farms decreased sig-nificantly from June to September(P＜0.05),while the calving rate increased significantly from March to August(P＜0.05).However,there were no significant changes in colostrum yield and colostrum quality in different months(P＞0.05).The birth weight of calves in southern farms was lowest in July and Au-gust(P＜0.05),being 3 kg lower in summer than in winter and lower than the corresponding data in northern farms(P＜0.05).Data for other months showed no significant differences between northern and southern farms(P＞0.05).The calf survival rate in northern farms showed a clear seasonal variation pat-tern(P＜0.05),with higher rates in summer and lower rates in winter.In summary,there are significant monthly variations in feed intake of cattle in southern farms,calf survival rate in northern farms,calving rate and calf birth weight in both northern and southern farms.Feed intake of cattle in northern farms,calf survival rate in southern farms,colostrum yield and quality in both northern and southern farms are not influenced by monthly variations.